Pump piston



March 15, 1932. E. KIBELE 1,849,096

PUMP PISTON Filed Deq. 11, 1928 Kai Patented Mar.'15,' 1932 umraa STA rm ris'ron' I 4 My invention relates to pisto such as are used in pumps and particularlythe double acting pumps which are used in maintaining a flow of -flus g fluid in well drilling operations. J

The improvement of this applicatlon 1s somewhat similar to the disclosure in; my prior. Patents No. 1,564,484, No. 1,595,805 and No. 1,604,287 as well as my co-pendmg application No. 325,298 filed on even date.

It is one of the objects of'my invention to provide a novel contour to the reinforcing rings. and supporting members such as will maintain the ring in constant engagement with the cylinder wall. k

Another object of my invention is to provide a resilient'ring having a r'eenforcing material embedded therein in such a manner as to resist distortion of the ring. p

80 I also aim to provide a piston wherein the hydraulic pressure is adapted to be exerted a upon the skirt of the piston ring to assist in maintaining a fluid sealwith the cylinder.

Still another object of my invention is toconstruct a piston ring having a novel contour such that a maximum clamping action may be exerted thereon but at the same time H a portion of the ring will be free to contact the cylinder wall and be subjected to the hydraulic pressure of the pump.

Other andi'urther objects of myinvention will be readily apparent to those skilled in the art to'which 'my invention appertains when the following description is taken in connection with the accompanying drawings wherein: a

Fig. 1 is a piston body and supp ing the rings and their parts position.

4 Fig. 2 is a cross section of one of the novel rings of my invention showing specifically the contour.

Fig. 3 is an enlarged detailed view showing another form which the ring may assume. a

Fig. 4 is a vertical section similar toFig.

1 and shows still another embodiment of my invention in which a single reinforced piston ring has been employed.

The reference character 2 indicates a piston central vertical section of theorting members showin assembled This PATENT oFFIcE EUGENE 0! BA? ANTONIO, TEXAS Application meg December 11.1520. Serial no, team.

rod havm a tapered portion and threaded at its ends. A piston, body or supporting tmexpber 11 is shown as firmly seated upon the P or supporting member comprises a sleeve or core member 10 which has a substantial length but is of less length than the width. of the entire assembled iston. The core 10 has a head which has a owl shapedcontour 1n cross section having a concave peri hery '12 which mefges with a rim 13 on the ower face of the head. The rim 13 is outstanding from the "inner pbrtion of the head whereby a groove 14 isformed where the head merges at right angles with the core 10. Toward the outer edge of the periphery 12. an annular in dentation is formed. The periphery 12, however, continues past this indentation to form a circular surface parallel with the shaft2. A flat face 72 forms the inner surface of the piston except for a concave central cavity 16 adjacent the piston rod 2. The follower plate 71 is formed with a head 73 similar to the head 11 of the body which has the outer face 77 similar to the face 7 2. I A plurality. of inlets 74 are uniformly placed in each the head and the follower plate and lead into the indentation 75. The piston ring is composed of two identical complementary sections which together are adapted to be clamped between the piston red portioiof the piston rod; Th1s body head and the follower plate and surround the core or sleeve 10. In the cross section the ring member appears as having a foundation 21 having an inner surface 20 contacting with the sleeve 10 and the outer edge of each section has a groove 22 adapted to seat about the rim .13. Beyond the grooves 22 each section is convexly flared as at 23 but extends radially beyond the edge of the flange.

I have alsoshown a stabilizer plate 78 as slidably mounted upon the core 10 and adapted to be retained between the ring sections. This stabilizer plate is preferably tapered so that it is widest at its periphery. Each ring section has a rib 79 which overlies substantially one-half of the stabilizer disc.

An annular ring of reinforcing material 59 is shown as embedded or vulcanized into the resilient-material of the piston ring.- These bers.

.rings are preferably of rubber or any suitable composition which can readily be distorted by the clamping Each ring section has a s rt? 6 which is adapted to be distbrted b hydraulic pressure exerted during the wor 'ng-stroke of the piston. This hydraulic pressure is adapted to act upon the skirt 76 by entering the inlet 74 and the indentation 75, pressing the skirt firmly a ainst the cylinder wall,and which has not een shown. The outer surface of the ring surface is preferably concaved as shown so that when the follower plate 71 is drawn up by means of the nut'17, pressure is applied both radially and axially tothe ring members which causes distortion adjacent the ribs 7 9. It will be noted that the reeinforcing material 59 is so arranged that resist the distortion of the rin It is to be understood that the ring of this embodiment may bemade undersizeand by theclamping action of the supporting members be enlarged to extend tightly against the cylinder walls. N f t The ring section shown in Fig 2.-1s some what similar to the rings of the Fig. 1,,fthe foundation 21 and groove 22 being. identical, but the skirt portion 76 is not necessarily concave as the Fig. 1 embodiment, and, is shown as beveled toward the red at 25 to form a skirt having the faces and 61 atrright angles to each other. The face-58 is adapted to contact with the wall of the cylinder and be distorted by the clamping action of the supportin'gmembers to be expanded radially: The reenforcing material 59 has also been shown in this figure. This ring section may be used if desired with the hydraulic pressure arrangement of the supporting members 10 cut out adjacentthe indentation so that the skirt is free to receive the hydraulic pres-] sure directly. Y r i v Fig. 3 shows the assembly of another form 45 of piston ring in which the inner surface 91 is formed at right angles to the face -which contacts the stabilizer disc 87. I J oining the surface 91 on the outer end is a reversed curve 92 which forms a foundation b 50 somewhat similar to the portion 21 of Fig- A straight face 88 joins the outer end of the reversed curve92 and connects with a radial surface 89 at right angles thereto. Connecting with the section 89 is a concave skirt portion 23 which is the same but somewhat shorter than the skirt portion 23 of Fig. 1. A reenforcing ring 87 .is also shown as embedded in the packing ring in this embodiment.

Fig. 4 shows a still differentembodiment of my invention in which the piston supporting member has .a head 52 in which a lip 54 extends inwardly to join thebody portion at 65 an acute angle. The follower plate 53 of action of the sup rting t em it willtend to as shown in Fig. 1, or the flange 77 maybe 1 this form is formed identical with the head f 52. so that the two flanges 54 when consid' .eredtogether form an annular ring having a trapezoidal-section. The piston .ring' is 1 shown in thisforln as being made up of a single ring member having a folmdation portion 41 ada ted to 'be clamped between the li 54, and a s 'rt portion 51 which overlies t ed entire head 53 and haying an inner surface ,55 which is parallel to the piston rod 2. The similar contac surface 56/is preferably concave; In t is, form I have shown'a reenforcing material as disclosed in two ring members- 50, one ofwhich lies in a radial posit on and one in a longitudinal-position.

n this manner as the supporting members are clamped together theradial ring 50 resists lateral movement of the piston rin whereas the annular rin 50 resists radii distortion. Itis intended, owever,'that these reenforcing materials ad itof sufiicient dis- 55 tortionto allow the piston ring to contact a with the cylinder wall as the supporting membersgare clamped together. I

' I haveshown'the follower late 53 as engagingthe'fe'nd of thesleeve o the body portion,butitis to: b'eunderstood that when the;

' piston 'is first 'assembledzthe follower plate, 1 may not contact; with" the 'end of the sleeve' but willallow'th ringtobe clamped. 'The; wear gradually ta es plac'eand in subsequent 95 adjustment. the ring is' maint'ained in contact .with the cylinder wall. e

I have disclosedherein severalenlbodiments ,7 ofmy presentimprovement/which,Isbelieve to be entirely, satisfactory andpractical for 9 the pu'rposein view: Nevertheless,&it is to be understood that-thezseveral essential parts of the-improved inbodiment might be c'on- 'str'ucted in other alternativeiforms than'it is y ere shownv and itis accordingly be'understood that in the further development of the piston that reserve the privilege of resorting' to all such. legitimate changes therein as may'bejfairly embodied within thespirit and scope of the invention asclaimed, f f Having .describedlmyinvention what'I desire to secure'bylLettersPatent is:

1; A piston for pumpsyincluding in comination a core, ajflange at each end thereof, each-flange-havinga bowl-shaped outer face and a'n inwardly tapered =periphery, a rib on the lower. edge of sald. periphery and a groove f between the rib and the core, an annular indentation in said periphery, a piston ring of larger outer circumference than said flanges, adapted to be engaged by said flanges, out- 7 wardly dished rigid rings spaced from said core to reenforce said ring, and inlets through said face to said indentation.

" 2. A piston for pumps including a core,

flanges thereon at opposite ends of the same, each flange having an inner annular radially extending area, an inwardly extending rib outside the same, and an outwardly curved ace outside said rib, a packing ring of comressible material between said flanges and tting within the space between the same, said ring being of slightly larger external diameter than said anges and adapted to be moved outwardly at each end when clamped in position, and metallic rings within said packing ring, the outer portion of said metallic rings being curved toward the ends of fitting within the space between the same,

said ring being of slightly larger external diameter than said flanges and adapted to be moved outwardly at each end when clamped in position, and metallic rings within said packing ring, the outer portion of said metallic rings being curved toward the ends of said piston and adapted to resist outward compression of said packing rings against the cylinder walls, said flanges having annular grooves on their inner faces and passages leading thereto .to assist in deflecting said packing ring outwardly by fluid pressure.

In testimony whereof I hereunto aflix my signature this 7th day of December, A. D.

EUGENE KIBELE. 

